JPH0641822U - Permeable membrane dehumidifier - Google Patents

Abstract

(57) [Abstract] [Purpose] A moisture permeable membrane tube is provided in a closed container-shaped outer tube having a dry gas inlet and outlet, and a dry gas is allowed to flow in the outer tube while the moisture permeable membrane tube is provided. In a permeable membrane dehumidifier that dehumidifies the gas flowing in the moisture permeable membrane tube by flowing a gas containing moisture inside, even if the moisture permeable membrane tube absorbs moisture and expands, the tube inside the outer tube Do not bend and block. [Structure] A support for a moisture permeable membrane tube is arranged in an outer tube, and the moisture permeable membrane tube is spirally attached to this support. Even if the moisture permeable membrane tube absorbs moisture and expands, the expansion of the tube can be absorbed by the increase in the circumference of the spiral without causing the tube to bend, thereby preventing the tube from being blocked in the outer tube. You can

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a moisture permeable membrane tube is provided in an outer tube in the shape of a closed container having an inlet and an outlet for dry gas, the dry gas is caused to flow in the outer tube, and the moisture permeable membrane tube is provided with moisture content. The present invention relates to a permeable membrane type dehumidifier that dehumidifies a gas containing moisture by flowing a gas containing water.

[0002]

[Prior art]

 Conventionally, as a permeable membrane type dehumidifier used for drying a sample gas containing moisture, one having a structure shown in FIG. 4 is known. In the dehumidifier a of FIG. 4, b is an outer tube in the shape of a closed container whose both ends are closed, and c and d are a dry gas inlet and a dry gas outlet provided at both ends in the length direction of the outer tube b, respectively. e is a moisture permeable membrane tube arranged in the outer tube b. The moisture permeable membrane tube e is made of a fluorine-based ion exchange membrane (trade name: Nafion) and is arranged in a straight tube at the center of the outer tube a, and both ends thereof are on both side walls of the outer tube b. It extends to the outside of the parts f and g.

When the sample gas containing moisture is dehumidified by the above-described dehumidifier a, first, the dry gas is continuously flowed from the dry gas inlet c into the outer tube b, and the dry gas is discharged. By continuously flowing out from d, the dry gas is introduced into the space h outside the moisture permeable membrane tube e inside the outer tube b. Next, in this state, when the sample gas containing moisture is continuously flown into the moisture permeable membrane tube e, the moisture contained in the sample gas permeates the wall of the moisture permeable membrane tube e and forms a space. Then, the sample gas is dehumidified.

[0004]

[Problems to be solved by the device]

 A major problem of the conventional dehumidifier a is the physical expansion of the tube e that occurs when the moisture permeable membrane tube e absorbs moisture. That is, when the dehumidifier a is used, it is generally used by connecting it to another pipe, and therefore at least both ends of the tube e are fixed to the other pipe. In this state, when a sample gas with a high humidity flows in the moisture permeable membrane tube e, the tube e absorbs moisture, softens and expands, and its length becomes longer than when dry, but both ends of the tube e are fixed. Therefore, as shown in FIG. 5, the tube e is bent at somewhere due to expansion, and a blockage point i is generated. Then, the sample gas stops flowing through the tube e, and dehumidification cannot be performed. The conditions for generating such a closed portion i are also related to the diameter, length, wall thickness, etc. of the moisture permeable membrane tube e, for example, a tube having an outer diameter of 3.1 mm, a wall thickness of 0.3 mm, and a length of 3 m. When e is used, the length that it expands when it absorbs moisture is 15 cm or more (5% or more), and the tube e is easily bent to form the closed portion i.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a permeable membrane dehumidifier that does not bend and block a moisture permeable membrane tube even if the moisture permeable membrane tube absorbs moisture and expands. To aim.

[0006]

[Means and Actions for Solving the Problems]

 As a result of earnest studies to achieve the above object, the present inventors have found that when the moisture permeable membrane tube e is spirally wound inside the outer tube as shown in FIG. 1, the moisture permeable membrane tube absorbs moisture. Even if the tube expands, the expansion of the tube can be absorbed by the increase of the circumference of the spiral without causing a bend as shown by the dotted line (e ') in the figure, which allows the tube inside the outer tube to absorb. The inventors have found that the blockage can be prevented, and have completed the present invention.

Therefore, the present invention provides a permeable membrane type dehumidifier comprising a closed container-shaped outer tube having an inlet and an outlet for a dry gas, and a moisture permeable membrane tube passing through the outer tube. A permeable membrane type dehumidifier characterized in that a support for a moisture permeable membrane tube is arranged in an outer tube, and the moisture permeable membrane tube is spirally attached to this support.

In the present invention, the structure of the outer tube is not limited, but it is preferable that the outer tube is composed of a container-shaped outer tube body having an opening and a lid for closing the opening. This allows the condition of the moisture permeable membrane tube to be viewed simply by disassembling the outer tube into the outer tube body and the lid, which is very convenient for maintenance. Also, the structure of the support is not limited, and the moisture permeable membrane tube whose shape is unstable can be held in a spiral shape and the expansion of the tube due to the increase in the circumference of the spiral shown in FIG. Any configuration that does not interfere with absorption can be used. Further, there is no limitation on the spiral diameter and the number of windings of the moisture permeable membrane tube, and it can be arbitrarily set according to the diameter, length, wall thickness, etc. of the tube to be used, but usually the diameter is 4 to 20 cm, especially 5 cm. It is preferable that the number of windings is ˜6 cm, and the number of windings is 3 to 100 times, particularly 20 to 30 times.

[0009]

【Example】

 Next, the present invention will be specifically described by way of examples, but the present invention is not limited to the following examples. FIG. 2 shows a permeable membrane type dehumidifier according to an embodiment of the present invention. In FIG. 2, reference numeral 1 denotes a headed cylindrical outer pipe body, and a dry gas outlet 2 is provided on the upper portion of the outer pipe body 1. Reference numeral 3 in the figure denotes a lid that closes the lower end opening 4 of the outer tube body 1. A sample gas inflow port 5, a sample gas outflow port 6 and a dry gas inflow port 7 are provided below the lid 3. The outer tube body 1 and the lid body 3 constitute an outer tube 8 in the form of a tightly closed container.

Reference numeral 9 in the figure shows a support of the moisture permeable membrane tube. In this support 9, 10 is three long plates in which a large number of circular holes 11 are bored along the length direction, 12 is three notched grooves 13, and 3 are provided in these notched grooves 13. The upper ends of the long plates 10 are fixed plates inserted and fixed respectively. The support body 9 is arranged on the lid body 3 by inserting the lower end portions of the long plates 10 into the grooves 14 formed on the upper surface of the lid body 3. Then, a moisture permeable membrane tube (fluorine-based ion exchange membrane: manufactured by Nafion, manufactured by Nafion, shown by a dashed line in the figure) 15 is sequentially passed through the circular hole 11 of each long plate 10 to allow moisture to permeate the support 9. The membrane tube 15 is attached in a spiral shape. Although not shown, stainless short tubes are inserted at both ends of the moisture permeable membrane tube 15, and these stainless short tubes are fixed to the sample gas inlet 5 and the sample gas outlet 6 by tube joints. There is.

When the sample gas containing moisture is dried by the dehumidifier of this example, first, the dry gas is continuously flowed from the dry gas inlet 7 into the outer tube 8 and continuously from the dry gas outlet 2. By flowing out, the dry gas is introduced into the space outside the moisture permeable membrane tube 15 inside the outer tube 8. Next, in this state, when the sample gas containing moisture is continuously flown from the sample gas inflow port 5 into the moisture permeable membrane tube 15, while the sample gas flows through the tube 15, the moisture contained in the sample gas is increased. Minutes pass through the wall of the tube 15 and move into the dry gas outside the tube 15 to dehumidify the sample gas. Then, the dehumidified sample gas flows out from the sample gas outlet 6.

FIG. 3 shows a permeable membrane type dehumidifier according to another embodiment of the present invention. In FIG. 3, the same components as those of the dehumidifier of FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. The support 20 used in this example has a structure in which three long plates 22 each having a large number of circular holes 21 formed along the length direction are fixed to the outer surface of a cylindrical substrate 23. Further, in the present support 20, a tube insertion groove 24 communicating with each circular hole 21 is formed on the outer side portion of the long plate 22. The support body 20 is placed on the lid body 3. Then, the moisture permeable membrane tube 15 is spirally attached to the support 20 by sequentially inserting the moisture permeable membrane tube 15 into the circular hole 11 of each elongated plate 22 through the tube insertion groove 24. Since the method of using the dehumidifier of this example is the same as that of the dehumidifier of FIG. 2, its explanation is omitted.

In the dehumidifiers of the above-described embodiments, since the moisture permeable membrane tube 15 is wound in a spiral shape, even if the tube absorbs moisture and expands, the tube does not bend and block. In this case, since the support bodies 9 and 20 are provided in the outer tube 8 and the moisture permeable membrane tube 15 is attached to the support bodies 9 and 20, the tube 15 having an unstable shape is surely made into a spiral shape. Can be held. Further, since the outer tube body 1 and the lid body 3 constitute the outer tube 8, the state of the tube 15 can be seen only by removing the outer tube body 1 from the lid body 3, and for maintenance or the like. It's very convenient. Furthermore, since the stainless short tubes 16 are inserted into both ends of the tube 15 and the stainless short tubes 16 are fixed to the sample gas inlet 5 and the sample gas outlet 6 by tube joints, special joints are required. Instead, the dehumidifier can be connected to other pipes.

[0014]

[Effect of device]

 As described above, the permeable membrane type dehumidifier of the present invention has the moisture permeable membrane tube provided spirally in the outer tube, so that even if the moisture permeable membrane tube absorbs moisture and expands, The sample gas can be dehumidified without breaking and clogging, and without disturbing the flow of the sample gas. In this case, in the present invention, the support is placed inside the outer tube, and the moisture permeable membrane tube is attached to this support, so that the moisture permeable membrane tube with an unstable shape can be stably held in a spiral shape. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state in which a moisture permeable membrane tube is wound in a spiral shape.

FIG. 2 is an exploded perspective view showing an embodiment of the present invention.

FIG. 3 is an exploded perspective view showing another embodiment of the present invention.

FIG. 4 is a schematic view showing a conventional permeable membrane dehumidifier.

5 is a schematic view showing a state in which the moisture permeable membrane tube of the dehumidifier of FIG. 4 is closed.

[Explanation of symbols]

 1 Outer Tube Main Body 2 Dry Gas Outlet 3 Lid 7 Dry Gas Inlet 8 Outer Tube 9 Support 15 Moisture Permeation Membrane Tube 20 Support

Claims (1)

[Scope of utility model registration request] 1. A permeable membrane type dehumidifier comprising a closed container-shaped outer tube having an inlet and an outlet for a dry gas, and a moisture permeable membrane tube passing through the outer tube, wherein moisture is contained in the outer tube. A permeable membrane type dehumidifier characterized in that a support for a permeable membrane tube is arranged, and a moisture permeable membrane tube is spirally attached to this support.